Refreshing Parameters... hangs

any idea why refreshing parameters in Tower and Tower beta both hang at 0% and 0/100?

Update the vehicle FW to the latest version. Update the GCS SW to the latest version. Make sure the radios are connected. make sure the antennas and antenna cables are correctly connected … etc

I am on the latest versions of vehicle FW and the Tower app. This issue is not antennas and cables. The connection is from Dragonlink Tx bluetooth to Android phone bluetooth, serial device, to Tower.